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Replacing a Car Key Fob You can save money by purchasing a replacement car key fob. It's possible to reprogram the fob from scratch and skip the dealership, but it's best to let an expert handle it. You might not be able to use an aftermarket key fob, and you may be in conflict with your lease restrictions. Here's what you can expect to pay for an aftermarket fob Battery Replacement Until recently, if you lost a car key and fob, all you needed to do was walk to your local hardware store